All wires are date coded based on the production quarter of the vehicle. "1-Q" indicates the first half of the production model year and "3-Q" indicates the 2nd half of the production year. Wiring sets are produced for vehicles with original exhaust manifolds.

All wires are date coded based on the production quarter of the vehicle. "1-Q" indicates the first half of the production model year and "3-Q" indicates the 2nd half of the production year. Wiring sets are produced for vehicles with original exhaust manifolds.

Officially licensed by General Motors.

Note: These are not for use with after market type headers or after market manifolds. Wiring may be applicable for use with other manifolds or headers but are not guaranteed to fit. 3Q dated plug wires may be correct for use on vehicles manufactured in the first months of the succeeding years production.